Quote Originally Posted by VintageDave View Post
The darn thing won't stay off even if I hold the power button. It's definitely not the way that button should work.
No it's not how it should work, and it's also indicative of a hardware problem.

I will try tomorrow morning when I'm fresh. I propose to reuse the 16GB card currently holding my map. It's already FAT32, I'll just backup and erase, and copy in the new payload with the patched boot.bin .
Don't put the patched boot.bin in the card! The flash in this instance is initiated by the RGN file made from it. There should be nothing else in the 1947 folder with the update.txt file. See post #350, one of the step points in that list is this: "Place update.txt file in the 1947 folder. There should be nothing else in that folder.". I suppose i should have highlighted that more.

I started to ask about flashing one region at a time, in separate attempts, but if as you say a successful start of script processing captures the system until the whole script has run through, I don't see any point in trying piecemeal if the whole-thing-at-once fails. What do you think?
Technically there's no reason not to run separate commands but it's probably pointless from a practical aspect. Likely either the flash will start and successfully finish, or it'll fail immediately after it initiates.